Check Engine Oil Level
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The IPC illuminates the CHECK ENG OIL LEVEL indicator in the message center when the PCM detects a low engine oil level condition and the engine oil level switch signal circuit is high. An open engine oil level switch indicates a low engine oil level and a closed engine oil level switch indicates the engine oil level is in the normal range. The CHECK ENG OIL LEVEL indicator illuminates for 60 seconds at the start of each ignition cycle when a low engine oil level condition is present. The IPC receives a class 2 message from the PCM requesting illumination.